A pyrano chalcone and a flavanone from Neoraputia magnifica

The hexane extract from the stems of N. magnifica var. magnifica, afforded two new flavonoids: 2'-hydroxy-3,4,4',5-tetramethoxy-5',6'-(2 '',2 ''-dimethylpyran)chalcone and 5,6,7,3',4',5'-hexamethoxyflavanone which were identified on the basis of spectroscopic methods. The known flavonoids 2'-hydroxy-3,4,4',5,6'-pentamethoxychalcone, 5,7,3',4',5'-pentamethoxyflavanone and 5,6,7,3',4',5'-hexamethoxyflavone, the sterols sitosterol and stigmasterol were also identified. These results do not seem to support the affiliation of Neoraputia to the tribe Cusparieae. (C) 1997 Elsevier Science Ltd. All rights reserved.